Best Amazon GEO-IP link localizer for WP?

So which Amazon GEO IP affiliate link localizer works these days?I have affiliate accounts at .com, UK and German Amazon. I want detailed control over which country IP's to send where. I also want to, in case a product does not exist on Ebay UK for example, have it default to the .com Amazon site. I found some product but it was limited in number of links. I want to have thousands of links.

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